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Minimum SDM configuration

Recently I had to investigate whether Cisco Router and Security Device Manager (SDM) uses a default username/password, so I was forced to figure out how exactly the SDM works. The minimum functionality needed on an SDM-enabled router is preconfigured Ethernet interface, HTTP server and (optionally) DHCP pool.Just in case you need to reset a router configuration into a state where you can reinitialize it with SDM, here's the minimum configuration to make it work:
! Use whatever your first Ethernet interface is here
interface FastEthernet0/0
ip address
duplex auto

ip http server
no ip http secure-server

ip dhcp pool SDM
Note: routers shipped from Cisco would usually include username cisco password cisco configuration command.

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